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s390/pci: prevent inadvertently triggered bus scans 

Initialization and scanning of the pci bus is omitted on older
machines without pci support or if pci=off was specified. Remember
the fact that we ran without pci support and prevent further bus
scans during resume from hibernate or after receiving hotplug
notifications.

Reported-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-12-12 17:48:32 +01:00 committed by Martin Schwidefsky
parent 99c64b6679
commit aa3b7c2967
3 changed files with 24 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/s390/include/asm/pci.h
View File

@ -144,6 +144,7 @@ int clp_disable_fh(struct zpci_dev *);
void zpci_event_error(void *);
void zpci_event_availability(void *);
void zpci_rescan(void);
bool zpci_is_enabled(void);
#else /* CONFIG_PCI */
static inline void zpci_event_error(void *e) {}
static inline void zpci_event_availability(void *e) {}

10
arch/s390/pci/pci.c
View File

@ -920,6 +920,7 @@ static void zpci_mem_exit(void)
}
static unsigned int s390_pci_probe;
static unsigned int s390_pci_initialized;
char * __init pcibios_setup(char *str)
{
@ -930,6 +931,11 @@ char * __init pcibios_setup(char *str)
return str;
}
bool zpci_is_enabled(void)
{
return s390_pci_initialized;
}
static int __init pci_base_init(void)
{
int rc;
@ -961,6 +967,7 @@ static int __init pci_base_init(void)
if (rc)
goto out_find;
s390_pci_initialized = 1;
return 0;
out_find:
@ -978,5 +985,6 @@ subsys_initcall_sync(pci_base_init);
void zpci_rescan(void)
{
clp_rescan_pci_devices_simple();
if (zpci_is_enabled())
clp_rescan_pci_devices_simple();
}

18
arch/s390/pci/pci_event.c
View File

@ -43,9 +43,8 @@ struct zpci_ccdf_avail {
u16 pec; /* PCI event code */
} __packed;
void zpci_event_error(void *data)
static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
{
struct zpci_ccdf_err *ccdf = data;
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
zpci_err("error CCDF:\n");
@ -58,9 +57,14 @@ void zpci_event_error(void *data)
pci_name(zdev->pdev), ccdf->pec, ccdf->fid);
}
void zpci_event_availability(void *data)
void zpci_event_error(void *data)
{
if (zpci_is_enabled())
__zpci_event_error(data);
}
static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
{
struct zpci_ccdf_avail *ccdf = data;
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
int ret;
@ -115,3 +119,9 @@ void zpci_event_availability(void *data)
break;
}
}
void zpci_event_availability(void *data)
{
if (zpci_is_enabled())
__zpci_event_availability(data);
}